The book is basically for the computer science researcher and it will also give the basic idea and implementation of data Classification algorithm.Data mining researcher also implementing the techniques using different data-sets.Data classification is an important task in KDD (knowledge discovery in databases) process. It has several potential applications. Feature selection reduces the dimensions and simplifies the data. It leads to better performance of the classification models in terms of their predictive or descriptive accuracy, diminishing of computing time needed to build models as they learn faster, and better understanding of the models.